Can any herb, supplement, and/or diet help prevent or treat COVID-19? We simply do not know. In China, which has the longest experience (months) treating this disease, they have published extensive papers and notes (not research studies) on how they used TCM (Traditional Chinese Medicine) formulas to try to prevent this disease and for treating patients with COVID-19 infections. The doctors using these complex formulas claim they were very helpful, but only clinical trials or retrospective studies will actually show how useful they actually were.